41 lines
812 B
PHP
41 lines
812 B
PHP
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<?php
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/*
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* Copyright (c) Alexandre Gomes Gaigalas <alganet@gmail.com>
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* SPDX-License-Identifier: MIT
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*/
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declare(strict_types=1);
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namespace Respect\Validation\Rules;
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use function is_string;
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use function mb_strlen;
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use function preg_match;
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/**
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* Validate if a string is Base64-encoded.
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*
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* @author Henrique Moody <henriquemoody@gmail.com>
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* @author Jens Segers <segers.jens@gmail.com>
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* @author William Espindola <oi@williamespindola.com.br>
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*/
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final class Base64 extends AbstractRule
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{
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/**
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* {@inheritDoc}
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*/
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public function validate($input): bool
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{
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if (!is_string($input)) {
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return false;
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}
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if (!preg_match('#^[A-Za-z0-9+/\n\r]+={0,2}$#', $input)) {
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return false;
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}
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return mb_strlen($input) % 4 === 0;
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}
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}
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